Sep. 17 4:31 PM PT5:31 PM MT6:31 PM CT7:31 PM ET23:31 GMT7:31 AM 北京时间4:31 PM MST6:31 PM EST6:31 PM CT3:31 UAE (+1)19:31 ET22:31 - The San Diego Chargers have signed free agent cornerback Crezdon Butler. To make room on the roster, the Chargers waived defensive end Drake Nevis. The transactions were announced Tuesday.Analysis: Butler was released by Buffalo at the end of training camp in 2013. He played in six games with the Bills in 2012, primarily on special teams. He was a fifth-round draft pick of the Pittsburgh Steelers in 2010. Butler played in four games as a rookie for the Steelers and was waived before the start of the 2011 season. He also has played with Arizona and Washington.